CBSE Class 10 Science Question Paper SA 2 2012 (8)

CBSE Class 10 Science Question Paper SA 2 2012 (8). Students can download the last year question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION  - A

1.      What is the range of vision of a normal human eye ?                                         

2.      Draw the structure of the simplest ketone.                                                  

3.      In a certain study conducted on occurrence of DDT along food chains in an ecosystem, the concentration of DDT in grass was found to be 0.5ppm (parts per million),  in sheep it was 2ppm and in man it was l0ppm.   Why was the concentration of DDT maximum in case of man ?

4.      Why has there been a large hue and cry against the use of CFCs  ?                              

5.      Why does the clear sky appear blue ?                                                        

6.      Why does it take some time to see the objects in a dim room when we enter the room   from bright sunlight outside 

7.  (a)    What happens to a ray of light  when it travels from one medium  to another  having equal refractive indices ?

(b)    State the cause of refraction of light.

8.   How has the use of fossil fuels led to the deterioration of environment ?  State any two  reasons.

9. (a)    State Modern Periodic Law.

(b)    Why is  position assigned to hydrogen in Periodic Table considered anomalous ?

10.   Account for the following  :                                                                  

(a)    Elements of group l8 are called zero valent.

(b)    Elements in a group of periodic table have similar chemical properties.

11.   With  the help of an example explain how involvement  of local people can lead to  efficient management of forests.

12.   In what respect is the human male gamete different from the female gamete ?

13.   What will  happen when :                                                                      

(a)    A mature Spirogyra filament attains considerable length ?

(b)    Planaria gets cut into two pieces  ?

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 2 2012 (8).